//
//  UIColor+HexColor.m
//  DDD
//
//  Created by apple on 16/5/18.
//  Copyright © 2016年 乾坤. All rights reserved.
//

#import "UIColor+HexColor.h"

@implementation UIColor (HexColor)

+ (UIColor *)colorWithHexString:(NSString *)color alpha:(CGFloat)alpha{
    
    /** 删除字符串中的空格*/
    NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];

    if ([cString length] < 6){
        return [UIColor clearColor];
    }
    
    /** 如果是0x开头的，那么截取字符串，字符串从索引为2的位置开始，一直到末尾*/
    if ([cString hasPrefix:@"0X"]){
        cString = [cString substringFromIndex:2];
    }
    
    /** 如果是#开头的，那么截取字符串，字符串从索引为1的位置开始，一直到末尾*/
        if ([cString hasPrefix:@"#"]){
        cString = [cString substringFromIndex:1];
    }
    
    if ([cString length] != 6){
        return [UIColor clearColor];
    }
    
    NSRange range;
    range.location = 0;
    /** R*/
    range.length = 2;
    NSString *rString = [cString substringWithRange:range];
    /** G*/
    range.location = 2;
    NSString *gString = [cString substringWithRange:range];
    /** B*/
    range.location = 4;
    NSString *bString = [cString substringWithRange:range];
    
    unsigned int r, g, b;
    [[NSScanner scannerWithString:rString] scanHexInt:&r];
    [[NSScanner scannerWithString:gString] scanHexInt:&g];
    [[NSScanner scannerWithString:bString] scanHexInt:&b];
    return [UIColor colorWithRed:((float)r / 255.0f) green:((float)g / 255.0f) blue:((float)b / 255.0f) alpha:alpha];
}

+ (UIColor *)colorWithHexString:(NSString *)color{
    return [self colorWithHexString:color alpha:1.0f];
}

@end
